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Lung cancer, ~80%-85% of which is non-small-cell lung cancer (NSCLC), is the leading cause of cancer-related mortality worldwide. Sensitizing mutations in epidermal growth factor receptor ( EGFR ) gene ( EGFR m + ), such as exon 19 deletions and exon 21 L858R point mutations, are the most important drivers in NSCLC patients. In this respect, small-molecule EGFR tyrosine kinase inhibitors (TKIs) have been designed and developed, which launched the era of targeted, personalized and precise medicine for lung cancer. Patients with EGFR m + could achieve good responses to the treatment with the first-generation EGFR TKIs, such as erlotinib and gefitinib. However, most patients develop acquired drug resistance mostly driven by the T790M mutation occurring within exon 20. Although the second-generation EGFR TKIs, such as afatinib, dacomitinib and neratinib, demonstrated promising activity against T790M in preclinical models, they have failed to overcome resistance in patients due to dose-limiting toxicity. Recently, the third-generation EGFR TKIs have shown to be effective against cell lines and murine models harboring T790M mutations while sparing wild-type EGFR, which represents a promising breakthrough approach in overcoming T790M-mediated resistance in NSCLC patients. This article provides a comprehensive review of the therapy revolution for NSCLC with three generations of EGFR TKIs.

Three generations of epidermal growth factor receptor tyrosine kinase inhibitors developed to revolutionize the therapy of lung cancer